The stepper motor cable is included in case you would like to take advantage of the X-Controller’s extra stepper driver. That part of the upgrade process is a “nice to have” option, not a necessity. If you don’t need to use the extra driver, just ignore the stepper motor cable. More information about rewiring the machine to use all four stepper drivers is available at the X-Controller Usage Instructions under “Option 2.”

NOTE: A 500mm machine cannot be upgraded to a 1000mm machine without additional parts.